Core-removing apparatus.



W. T. DUNN.

CORE REMOVING APPARATUS. l APPucATloN man JUNE r9, 1917.

1 ,288,702. Patented Nov. '5, 1918..

Eiga. 5 3 2 l 0 9 i //0 20 I i l jf 6 n `,/9 J9 A H /f V7 /f/ UMTEDSTATES. PATENT oF'FIcE.

WILLIAM TOMAS DUNN, OF ROCKAWAY, NEW JERSEY, ASSIGNOR T0 INTERNATIONALHIGH SPEED STEEL COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

CORE-REMOVING APPARATUS.

Specication of Letters Patent.

Patented Nov. 5, 1918.

To all whom it may concern.'

Be it known that I, WILLIAM THOMAS DUNN, a citizen of the United Statesof America, residing at Rockaway, Morris county, State of New Jersey,have invented new and useful Improvements in Core-Removing Apparatus, ofwhich the following is a specification. l

This invention relates to core removing. apparatus.

The object of the invention is to provide an efficient apparatus forrapidly removing the sand core from the bars used in makingl tubulardrills of steel. A further and more specific object is to provide insuch an apparatus a drilling element which is self sharpening and in theuse of which air under a very low degree of compression may be used.

The invention consists of the construction, combination and arrangementof parts, as herein illustrated, described and claimed.

In the accompanying drawing, forming part hereof, is illustrated a formof embodiment of the invention, in which drawing similar referencecharacters designate cor responding parts, and in which: Y

Figure 1 1s a plan view;

Fig. 2 is a side elevation;

Fig. 3 is a side elevation partly in section of a billet from whichtubular drill bars are drawn;

Fig. 4 is a side elevation partly in section of the drill bar afterbeing drawn; and

Fig. 5 is a side elevation of the cutting end of the drilling elementsof the apparatus herein described.

In the making of tubular bars for the manufacture of tubular drills, abillet 21 of steel is first provided with a bore 22 and the bore 22 isfilled with sand or similar silicious material 23. Plugs 24 lare securedin the ends of the bore 22 and the billet 21 is then heated in a furnaceand afterward subjected to the action of a rolling apparatus so that itbe# comes elongated, as best shown in Fig. 4. During this rollingVoperation the body of silicious matter 23, under the action of heat andpressure incident to the rolling operation, becomes very closely packedand vitrified. The removal of this core in the drill bar has resenteddifficultiesto the manufacturerin that no eflicient means has come intopublic use for; rapidly removing the lcore 23, which, owing to itsnature, resists the action of even the hardest .drill so that theordinary drill becomes dull before the entire bore is traversed. It istoovercome this difliculty that the present invention -was made.

As best shown in Figs. 1 and 2, a base 1 has disposed thereover aframework 2, comprising in part a cross bar 3, through which pass thebars 4 from which the cores 23 are to be removed. The bars 4 rest upongrooved rollers 5, carried by the framework and are pushed or otherwiseconveyed downward on the framework 2, so that the drilling element 14,hereinafter described, passes entirely through the bore 22 and removesthe core 23. Y

A suitable motor 6 is disposed adjacent one end of the frame 2,preferably on the base 1, and is arranged to run a belt 7, disposed overa pulley 8, on a shaft 9. The

shaft 9 is disposed in bearings 10 on the lower end of the frame 2 andcarries pulleys 11. Suitable belts 12 are disposed over the pulleys 11and over pulleys 13 arranged to rapidly rotate the drill 14. Theposition ofthe drill 14 coincides `with the axes of the bars 4 and thelengths of the drills are greater than the bars 4 to be drilled.

A pipe 15 is carried by one end of the framework 2 and is connected to asuitable source of air supplyl under a very low deto the drills 14 andto the pipe 15, a suitable otally connected to the' base 1, so thatdifferent degrees of inclination may be obtained, suitable telescopingsupporting legs v19 being attached to the frame 2r and set vree ofcompression. Pipes 17 are connected screws` 2O being used to fix theheight of the supporting legs 19.

The external diameter of the drills 14 is the same' as the bores 22 ofthe bars 4. At the cutting endof the drills 14, an outside taperedportion 25 is formed terminating at the wall of the bore 22,to form acutting edge (see Fig. 5).A `In the operation ,of the apparatus, thedrills 14 being rapidly rotated, the tapered portion25 is gradually wornback by attrition of the vitrled core 23 of the bars 4. In forming thetaper 25,

the wall of the bore 22a of the drill 14 forms a cutting edge of lessdiameter .than the bores 22 of the bars 4, and as the drills 14 rapidlyrotate the air under a slight com ression Yblows back the disintegratedvitr' ed core 23. To adjust the feed, the frame 2 may be raised orlowered and fixed in any desired position by the set screws 20 and legs19.

Having thus fully described my invention, what I claim as new andLetters Patent is:

l. A core removing apparatus comprising an inclined Work-supportingframe, a plurality of drills disposed at one end of the frame and meansfor rotating the drills.

2. A core removing apparatus comprising a Work-supporting frame, meansfor fixing the frame at varying degrees of inclination, a plurality ofdrillsV carrled by the frame-at one end and means forrotating thedrills.

3l A core removing apparatus comprising a Work-supporting frame, telesco'in supporting legs arranged to support t e rame,

set screws arranged to secure the legs at a plurality of heights to varythe movement of the Work on the frame, a plurality of drills carried bythe frame and means for rotating the drills.

4. A core removing apparatus comprising an inclined frame, a pluralityof drills cardesire to secure by isaearoa ried by the frame, means forrotating the Y guiding bars to the ,alinement with the drilk.

6. A core removing apparatus comprising a work-supportina frame, aplurality of drills carried by the frame, means for rotating the drillsand means for admitting compressed air through the drills.

7. A core removing apparatus comprising a Work-supporting frame, aplurality of tubular drills carried by the frame and provided with taered ends and means for rotating the dri s. "A1

8. A core removing apparatus comprising an inclined Work-supportingframe, a plurality of tubular drills having tapered ends and rotatablysupported on the frame, means for admitting compressed air through thedrills and means for rotating the drills.

ln testimony whereof I have signed my name t0 this specification.

WLI THOMAS DUNN.

